Weyloran, Ioun's Fallen

Double Strike, Haste
When Weyloran deals combat damage to a player
look at the top card of that player's library and
the top card of your library.
Exile one of those cards with a knowledge
counter on it.
You may cast the exiled card and you may spend
mana as though it were mana of any type to cast
that spell.
Partner with Exile, Golden Sky